AI High Speed Look Ahead parameter settings

[JSwistak]

We are running a large horizontal CNC with a Fanuc 31i B5 control. We purchased the AI Look Ahead (G05.1Q1/G05.1Q2 ) option but all parameters related to the option 

are still at zeroes. For this control the parameter numbers are #8486-9492 and #19581-19591.  Most of the values are maximum distance, minimum distance, max angle, min angle etc. 

We were also told we should have Fanuc come in and do a servo-tuning for this option. Not sure how long it will take to get Fanuc in the building but some starting point parameter settings would be a great help. The machine is set to run in inches, not metric.  I have programmed a swarf cut in Mastercam and this causes x, y, z to move as well as the table B. I turn on the AI look ahead with a G05.1Q2X0Y0Z0 command just after the G43 tool length.  We are using G54.2P1 dynamic fixture offset. The AI2 flashes on the screen during the tool path operation. We found that the roughing passes look better than the finish passes so we run with the tolerance up higher for less code. This is a large machine so we are pivoting about 50" from the center of the table for this cut.

[cncappsjames]

I reccommend you get FANUC in there as well. 

Odd that at least a generic set of numbers didn't come from the factory. 

What machine is it? If I have a machine around that size I'll numbers from it.

Thing is you don't want to move too quickly because you'll have other problems. 

[JSwistak]

https://www.youtube.com/watch?v=zfbOKBbkkL0 

The above link is the machine.  Kuraki kbt13 Max.  I named it Godzilla and the Japanese guys loved that. 

Thanks for the reply cncappsjames

 

[Jake L]

5 hours ago, JSwistak said:

https://www.youtube.com/watch?v=zfbOKBbkkL0 

The above link is the machine.  Kuraki kbt13 Max.  I named it Godzilla and the Japanese guys loved that. 

Thanks for the reply cncappsjames

 

Jesus that thing is massive. The operator gets an elevator!? What type of work you guys have planned for it?

[Aaron Eberhard]

38 minutes ago, Jake L said:

Jesus that thing is massive. The operator gets an elevator!? What type of work you guys have planned for it?

Yeah... I wish there was a jaw-drop emoji. 

[JSwistak]

Aaron,

     That machine gets everything that is too big for the other horizontals. What is cool is we have a 5' diameter Tsudakoma rotary 5th Axis to go with it. Also, besides the G05.1 Q2 we are working to get G68.2 and TCP set up. 

[Newbeeee™]

The fastest, the safest, and overall the easiest way, is to get Fanuc in. Specify n the PO, EXACTLY what you want them to do.

They can plug their laptop in which monitors all the servo loads etc and then they can tune your machine accordingly, allowing for the table mass/inertia (acc/dec) etc etc.

Just entering random numbers into the control when everything is currently 0, is a total waste of time. 

[JSwistak]

Newbeee,

     Thanks for responding to my post. The parameter settings aren't servo related, they are max and min distance and rotation axis settings for using G05.1q2 smoothing. But either way I don't like to change settings unless I am sure I am doing the right thing. I agree that we should let Fanuc make their adustments to the machine settings.

Jswistak

     

[Newbeeee™]

15 hours ago, JSwistak said:

Newbeee,

     Thanks for responding to my post. The parameter settings aren't servo related, they are max and min distance and rotation axis settings for using G05.1q2 smoothing. But either way I don't like to change settings unless I am sure I am doing the right thing. I agree that we should let Fanuc make their adustments to the machine settings.

Jswistak

     

My reply was aimed at your 1st post sentence We were also told we should have Fanuc come in and do a servo-tuning for this option

Having had 3x far smaller and lighter VMC's from a MTB that did have "figures" in the control, my experience of running lookahead made the machines on direction changes, beat itself to death. The cabinet sounded like someone hitting it with a mallet when changing direction (mechanical shock - acc/dec), and the finishing (bottom of the cutter) was like a ploughed field. But only on direction changes.

You have many many more lbs of inertia - hence my suggestion.

[TFarrell9]

I've always heard of Kuraki as a premier-level MTB, I'm a bit surprised they didn't verify these functions during install. I haven't yet dealt with machines with these kinds of options, but I assumed these would be tested during install. Is that not standard?

[JSwistak]

The option was purchased a year or so after being installed. I am surprised Fanuc didn't mention this servo tuning when we called them in to turn on the option. 

I have run and programmed  Kuraki machines since 1996, and they are a great MTB. The Kuraki service is excellent- Japan via Chicago.  You are correct about testing features before signing off on the installation- all machine options should be verified.  The newer G54.4, G68.1 and G43.4 should be proved out if that is the route you are taking. We are in the process of changing over our Mastercam post to run certain new machines this way.

[MIL-TFP-41]

I would be amazed if Kuraki didn't have some sort of starting point for you parameter wise. Yes it is a big machine, and while you don't see them everyday, there are a few out there....and there has got to be more than one with this relatively common option.  Have you reached out to Kuraki for the parameters?

[JSwistak]

MIL-TFP-41,

     Not a bad idea. I can send the sales guy a message and he can forward to Kuraki USA in Chicago. Thanks. 

[cncappsjames]

The closest machine parameters I have to that size is about 1/2...

Best I can do is some program formatting for the functions;

(G05.1Q1 w/ G43.4 w/ G68.2 Pre-Position and 3D Cutter Comp)

G05.1Q1
G00G90G54A-1.016C84.106
G68.2X0.0Y0.0Z0.0I84.106J-1.016K0.0
G53.1
X0.1389Y-0.039
G69
G43.4L1P3Z0.8588H#517S13875M03
X0.0379Y0.1358Z0.8602
X0.0511Y0.1344Z0.1103
X0.0537Y0.1341Z-0.0396
G01G41.2X0.0549Y0.134Z-0.1076D#517F200.0

......

G40X0.0476Y0.1333Z-0.1088
G00X0.0356Y0.1512Z0.859
G05.1Q0
G00G90G49G53Z0.0

(G05.1Q1 w/ G54.4 w/ G43.8 w/ G68.2 and 3D Cutter Comp)

G05.1Q1
G00G90G54A-29.755C-147.24
G54.4P2
G68.2X0.0Y0.0Z0.0I-147.24J-29.755K0.0
G53.1
X0.5398Y0.4636
G69
G43.8Z1.2495H#517D#517S#515M03T0
X0.0994Y-1.152Z0.8547,L2I0.5411164J-0.840937K0.004251
X-0.102Y-0.839Z0.2035,L2I0.5411164J-0.840937K0.004251
X-0.1423Y-0.7764Z0.0733,L2I0.5411164J-0.840937K0.004251

......

G00X-0.2313Y0.2439Z-0.1275,L2I0.3484266J0.9273712K0.136314
G05.1Q0
G00G90G49G53Z0.0
G54.4P0

(G05.1Q1 w/ G54.4 w/ G68.2 w/ G05.1 Q3)

G05.1Q1
G00G90G54A0.0C0.0
G54.4P2
G68.2X0.0Y0.0Z0.0I-0.0J0.0K0.0
G53.1
X2.75Y-2.38
G43Z2.0H#517M03S11460
G05.1Q3X0Y0Z0
Z0.0
G01Z-1.3667F120.0
G41X2.0D#517

....

G01G40X2.718
G00Z2.0
G05.1Q0
G00G49G90G53Z0.0
G69
G54.4P0

 

Hopefully this helps somewhat.

[JSwistak]

Ol' Godzilla is a big machine alright. Thank you for the sample code- I will keep it handy as we get deeper into G54.4 and G68.2 etc.